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Linshizhi
ffmpeg.wasm-core
Commits
6499e63f
Commit
6499e63f
authored
Nov 14, 2014
by
Benoit Fouet
Committed by
Michael Niedermayer
Nov 14, 2014
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avcodec/pngdec: create a function to decode tRNS chunk.
Signed-off-by:
Michael Niedermayer
<
michaelni@gmx.at
>
parent
4f313a50
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1 changed file
with
20 additions
and
13 deletions
+20
-13
pngdec.c
libavcodec/pngdec.c
+20
-13
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libavcodec/pngdec.c
View file @
6499e63f
...
...
@@ -694,6 +694,25 @@ static int decode_plte_chunk(AVCodecContext *avctx, PNGDecContext *s,
return
0
;
}
static
int
decode_trns_chunk
(
AVCodecContext
*
avctx
,
PNGDecContext
*
s
,
uint32_t
length
)
{
int
v
,
i
;
/* read the transparency. XXX: Only palette mode supported */
if
(
s
->
color_type
!=
PNG_COLOR_TYPE_PALETTE
||
length
>
256
||
!
(
s
->
state
&
PNG_PLTE
))
return
AVERROR_INVALIDDATA
;
for
(
i
=
0
;
i
<
length
;
i
++
)
{
v
=
bytestream2_get_byte
(
&
s
->
gb
);
s
->
palette
[
i
]
=
(
s
->
palette
[
i
]
&
0x00ffffff
)
|
(
v
<<
24
);
}
bytestream2_skip
(
&
s
->
gb
,
4
);
/* crc */
return
0
;
}
static
int
decode_frame_png
(
AVCodecContext
*
avctx
,
void
*
data
,
int
*
got_frame
,
AVPacket
*
avpkt
)
...
...
@@ -771,20 +790,8 @@ static int decode_frame_png(AVCodecContext *avctx,
goto
skip_tag
;
break
;
case
MKTAG
(
't'
,
'R'
,
'N'
,
'S'
):
{
int
v
,
i
;
/* read the transparency. XXX: Only palette mode supported */
if
(
s
->
color_type
!=
PNG_COLOR_TYPE_PALETTE
||
length
>
256
||
!
(
s
->
state
&
PNG_PLTE
))
if
(
decode_trns_chunk
(
avctx
,
s
,
length
)
<
0
)
goto
skip_tag
;
for
(
i
=
0
;
i
<
length
;
i
++
)
{
v
=
bytestream2_get_byte
(
&
s
->
gb
);
s
->
palette
[
i
]
=
(
s
->
palette
[
i
]
&
0x00ffffff
)
|
(
v
<<
24
);
}
bytestream2_skip
(
&
s
->
gb
,
4
);
/* crc */
}
break
;
case
MKTAG
(
't'
,
'E'
,
'X'
,
't'
):
if
(
decode_text_chunk
(
s
,
length
,
0
,
&
metadata
)
<
0
)
...
...
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